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Periodic Table & Electrons Valence Electrons – electrons that are in the highest energy level of an atom. Example: Silicon 1s 2 2s 2 2p 6 3s 2 3p 2 4 valence.

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Presentation on theme: "Periodic Table & Electrons Valence Electrons – electrons that are in the highest energy level of an atom. Example: Silicon 1s 2 2s 2 2p 6 3s 2 3p 2 4 valence."— Presentation transcript:

1 Periodic Table & Electrons Valence Electrons – electrons that are in the highest energy level of an atom. Example: Silicon 1s 2 2s 2 2p 6 3s 2 3p 2 4 valence electrons…

2 Periodic Table & Electrons Representative elements (groups 1, 2, 13-18) Valence electrons = last number in the group number. Silicon Group 14 = 4 valence e - ! [http://academic.reed.edu/chemistry/roco/Lewis/images/periodic.gif]

3 Periodic Table & Electrons Noble gases have 8 valence electrons. This property makes them inert, or unreactive. Neon = 1s 2 2s 2 2p 6

4 Periodic Table & Electrons Other atoms form ions so that they have 8 electrons in the highest level. [http://home.att.net/~cat6a/images/form_Na_ion.jpg]

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6 [http://www.chemprofessor.com/ptable4.gif]

7 Ionization Energy The energy needed to remove an electron from an atom. [http://www.iun.edu/~cpanhd/C101webnotes/modern-atomic-theory/images/ionization-energy.jpg]

8 [http://www.chemistry.ohio-state.edu/~grandinetti/teaching/Chem121/lectures/periodic%20trends/ionization_table.JPG]

9 Ionization Energy There are also 2 nd Ionization Energies (remove 2 nd electron) and 3 rd Ionization Energies (remove 3 rd electron). Pg. 180

10 Electronegativity The measurement of how much an atom “attracts” extra electrons.

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12 Atomic Radius Distance from the center of an atom to the outermost electron. Ba, Ca, Sr [http://wps.prenhall.com/wps/media/objects/602/616516/Media_Assets/Chapter05/Text_Images/FG05_20-07UN.JPG]

13 [http://images.encarta.msn.com/xrefmedia/aencmed/targets/illus/ilt/1e67a7ad.gif]


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